Question

a body projected horizontally with speed 2om/s.what will be its speed nearly after 5 sec

Answer 1

Answer:

Since, body is projected horizontally with a velocity of 20m/s.

ux=20m/s

ax=0

So, vx=20m/s for all time.

Along vertical axis,

uy=0

t=5

$$ay = 10m/s2$

vy=?

vy=uy+ayt

=>vy=0+10∗5=50m/s

So, magnitude of velocity of body after $$5s$

{(50)  

2

+(20)  

2

}

​  

m/s

=  

2900

​  

m/s

=53.851m/s

=54m/s.

Hence,

option (C) is correct answer

Explanation: